重命名客户端相关术语为节点；移动 utils 包到根路径；优化网关对节点各种连接状态的处理，并在节点断联后统一清理资源

gateway/fwd/user.go

@@ -4,17 +4,17 @@ import (
 	"context"
 	"encoding/hex"
 	"errors"
+	"io"
 	"log/slog"
-	"net"
 	"proxy-server/gateway/core"
 	"proxy-server/gateway/env"
 	"proxy-server/gateway/fwd/dispatcher"
 	"proxy-server/gateway/fwd/metrics"
-	"proxy-server/pkg/utils"
+	"proxy-server/utils"
 	"time"
 )
 
-func (s *Service) listenUser(port uint16, ctrl net.Conn) error {
+func (s *Service) listenUser(port uint16, ctrl io.Writer) error {
 	dspt, err := dispatcher.New(port, time.Duration(env.AppUserTimeout)*time.Second)
 	if err != nil {
 		return err
@@ -48,7 +48,7 @@ func (s *Service) listenUser(port uint16, ctrl net.Conn) error {
 	}
 }
 
-func (s *Service) processUserConn(user *core.Conn, ctrl net.Conn) (err error) {
+func (s *Service) processUserConn(user *core.Conn, ctrl io.Writer) (err error) {
 
 	// 发送代理命令
 	err = s.sendProxy(ctrl, user.Tag, user.Dest.String())